If you have a working xfstt server, it is easy to configure
ghostscript to use TrueType fonts. We simply execute the
following command:

# xfstt --gslist --sync >> /etc/gs.Fontmap

In practice, I've found it beneficial to make several small changes
to the font definitions generated by xfstt. First, if a font name
does not contain any spaces, I change the name to the usual notation.
If a font name does contain spaces, I replace all spaces with dashes
and the original name is added as an alias to the new name.

Finally, I prepend TTF- (or MS-) to all font names to
minimize problems caused by a TrueType font having an identical
name to an preexisting font.

The aliases ensure that ghostscript and xfstt can still
specify the same font by a common name.

Much more significantly, with the change in the font names it's possible
to instruct ghostscript to use TrueType fonts instead of the
standard fonts. The documentation claims that this is also possible with
parenthetical notation, but I could not get it to work.

For instance, we can instruct ghostscript to replace Helvetica fonts
with Microsoft's free Arial fonts by appending the following lines to the
/etc/gs.Fontmap file:

The best way to verify that ghostscript is properly configured to use
TrueType fonts is to print font specimen pages. Assuming that you're
running ghostscript 5.50 and that it is your default print queue,
you can print all TrueType fonts with the following command: